Kyung Soo Choi, Korea Institute of Science and Technology
Abstract
Quantum networks are composed of quantum nodes that interact coherently through quantum channels, and open a broad frontier of scientific opportunities. For example, a quantum network can serve as a ‘web’ for connecting quantum processors for quantum computation and communication, or as a ‘simulator’ allowing investigations of quantum critical phenomena arising from interactions among the nodes mediated by the channels. By extension, one can envisage a ‘quantum circus,’ a macroscopic quantum system which provides an exciting playground for strongly correlated photons and (atomic) spins. In this talk, I will discuss a series of recent experiments, where single collective spin excitations (analogous to magnons) in ultracold atomic ensembles are strongly coupled to optical modes, and provide efficient means for the coherent control of entangled states between matter and light. Finally, I will also describe recent endeavors to integrate these quantum elements into quantum circuits with nanoscale optical structures, and discuss future prospects of probing novel mesoscopic quantum phenomena with strongly correlated atoms and photons confined to low dimensions.